Journal
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
Volume 4, Issue 6, Pages 599-604Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1016/j.stam.2003.09.019
Keywords
Optical properties; Electroabsorption; Excitons
Categories
Funding
- Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporation, Japan
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We have performed optical absorption and electroabsorption studies on the lead-iodide-based natural quantum-well perovskite-type crystals with different well width (C6H13NH3)(2)(CH3NH3)(m-1)PbmI3m+1. With decreasing well thickness, m; the resonance energies of the lowest-energy excitons shift to higher energy due to the increase of the bandgap. The binding energies and oscillator strengths of the excitons drastically increase due to the spatial confinement and image charge effect with decreasing m: The bandgap of (C6H13NH3)(2)(CH3NH3)(m-1)PbmI3m+1 (m >= 2) can be reproduced by the effective-mass approximations, while the effective-mass approach is not valid for (C6H13NH3)(2)PbI4 (m = 1). (C) 2004 Elsevier Ltd. All rights reserved.
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